Heat-transmitter.



H. FRIBDENTHAL. HEAT TRANSMITTER.

APPLICATION FILED AUG. 13, 1907.

Patented Nov. 16. 1909.

2 SHEETS-SHEET 1.

VWT/VESSES H. FRIEDENTHAL.

HEAT TRANSMITTER.

APPLICATION FILED AUG. 13, 1907.

Patehted Nov. 16,1909

2 SHEETS-SHEET 2 .4

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Specification of Letters Patent.

Patented Nov. 16, 1909.

Application flled August 13, 1907. Serial No. 888,870.

T 0 all whom it may concern:

Be it known that I, HANS FRInonN'rHAL, private lecturer, residing at 4 Prinz Friedrich Leopold strasse, Nicolassee, near Wannsee, in the Kingdom of Prussia, Germany, and a Prussian subject, have inventednew and useful Improvements in Heat-Transmitters and Steam-Generators, of which the following is a specification.

The present invention refers to heat transmitters, that is to arrangements which may serve as steam boilers, steam generators, condensers, economizers and superheaters, and has the purpose to give a design for such arrangements, by which, compared with known arrangements the surfaces receiving the heat are enlarged and a greater transmission of heat is obtained, so that the single parts of the arrangement cannot be overheated.

In the accompanying drawing Figure l is avertical section through a heat transmitter, which consists of several systems of pipes arranged crosswise over each other; Fig. 2 is a vertical section at right angles to the section in Fig. 1; Fig. 3 is a modification of the invention, employed chiefly as steam generator; Fig. 4; is a horizontal section through Fig. 3.

In the design shown in Figs. 1 and 2 several sets of pipes arranged crosswise over each other are employed, the walls of which are connected by metallic, heat conducting means.

The pipes a of say square section of the one set open together into the chambers b provided with inlet and outlet nozzles h and m, Fig. 2. At right angles to the pipes a and connected thereto by metallic means is arranged the set of pipes a, which open into chambers 01 with nozzles and g, Fig. 1. Partitions e render it possi le to employ the return current principle, as by such partition the way of the liquid, gas or steam employed for heat transmission can be controlled.

It will'be understood that fluids of different temperatures flow through the different sets of pipes so that heat from the fluid of high temperature is imparted to the fluid of low temperature.

By the above described arrangement of two sets of pi es crosswise arranged, it is ossible to pro uce the largest heat conductmg surface within the smallest space. the same time by this arrangement, in which there are no parts subject to wear and destruction, and which combines the whole heat transmitter in one solid block, it is obtained, that each single pipe can act by the crosswise arranged pipes as if it had radiator webs. By this arrangement furthermore the great advantage is obtained, that any local heating will speedily spread over the entire system of pipes, whereby, contrary to other designs, an overheating or glowing of the single pipes is entirely avoided. The large number of open soldered joints, which were the weak points of the heat transmitters employed heretofore, are entirely avoided here.

The design of the hereinbefore described heat transmitters allows of employing it for steam boilers, condensers, economizers and superheaters, and afiords in each of these instances the above described advantages.

The crossed sets of pipes are connected and secured by metallic means according to their purpose by tin solder, hard solder or by casting them out, whereby pipes of square section allow of a very economic use of such medium.

Where the arrangement is to be employed for the production of highly superheated steam, it is advisable to cast out the whole sets of pipes completely with metal, and it will be good to have the single pipes of each system continuously connected with each other, so that a serpentine pipe embedded in metal is obtained. Such amodification is illustrated in Figs. 3 and 4. Here the serpentine pipe 2' is embedded in the plate 1 made of cast-iron, bronze, brass or any other suitable metal. Between the single curves of the pipe i passages k are transversely provided, which are suitably cast at the same time with the plate, Into these passages sockets or pieces of tube may be inserted, whereby the strength of'the plate is increased on the inside of the passages. These transverse passages it serve aspas- .sage for the hot gases and increase at the same time the surface receiving the heat, as

also a greater strength of the plates, by the danger of a fracture of the plate by unequal expansion being reduced. Also the occurring of unequal tension in the serpentine is thereby avoide Having now described my. invention what I claim and desire to secure by Letters Patent of the United States is:

1. A heat transmitter comprising a body having a series of tubes for a fluid of one of equal cross section, substantially as de' I temperature and another series of tubes in scribed. proximity to said first named tubes and ex- In witness whereof I have hereunto signed tending at right angles thereto for a fluid my name this 29th day of July 1907, in the I 5 of'a different temperature, substantially as presence of two subscribing witnesses.

described.

2. A heat transmitter consisting of'a ser- HANS FRIEDENTHAL' pentine pipe being embedded in a metallic Witnesses: plate, which is provided with numerous WOLDEMAR HAUPT,

10 transverse passages uniformly arranged and HEN 'HA'sPER. 

